| Iowa City to Oak Harbor (Washington) | 1,575.63 mi (2,535.73 km) |
| Iowa City to Oak Hills (Oregon) | 1,579.16 mi (2,541.41 km) |
| Iowa City to Oak Lawn (Illinois) | 194.94 mi (313.73 km) |
| Iowa City to Oak Park (California) | 1,563.85 mi (2,516.77 km) |
| Iowa City to Oak Park (Illinois) | 193.39 mi (311.23 km) |
| Iowa City to Oak Park (Michigan) | 431.68 mi (694.72 km) |
| Iowa City to Oak Ridge (Florida) | 1,073.75 mi (1,728.03 km) |
| Iowa City to Oak Ridge (New Jersey) | 883.16 mi (1,421.31 km) |
| Iowa City to Oak Ridge (Tennessee) | 553.19 mi (890.27 km) |
| Iowa City to Oakdale (California) | 1,573.49 mi (2,532.28 km) |
| Iowa City to Oakdale (Minnesota) | 241.21 mi (388.18 km) |
| Iowa City to Oakland (California) | 1,643.55 mi (2,645.04 km) |
| Iowa City to Oakland (New Jersey) | 896.38 mi (1,442.59 km) |
| Iowa City to Oakland Park (Florida) | 1,250.06 mi (2,011.78 km) |
| Iowa City to Oakleaf Plantation (Florida) | 959.98 mi (1,544.94 km) |
